| 1 | /* |
|---|
| 2 | * Copyright (c) 2011 Aeroflex Gaisler |
|---|
| 3 | * |
|---|
| 4 | * BSD license: |
|---|
| 5 | * |
|---|
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
|---|
| 7 | * of this software and associated documentation files (the "Software"), to deal |
|---|
| 8 | * in the Software without restriction, including without limitation the rights |
|---|
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
|---|
| 10 | * copies of the Software, and to permit persons to whom the Software is |
|---|
| 11 | * furnished to do so, subject to the following conditions: |
|---|
| 12 | * |
|---|
| 13 | * The above copyright notice and this permission notice shall be included in |
|---|
| 14 | * all copies or substantial portions of the Software. |
|---|
| 15 | * |
|---|
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
|---|
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
|---|
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
|---|
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
|---|
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
|---|
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
|---|
| 22 | * THE SOFTWARE. |
|---|
| 23 | */ |
|---|
| 24 | |
|---|
| 25 | |
|---|
| 26 | #include <asm-leon/leonstack.h> |
|---|
| 27 | #include <asm-leon/asmmacro.h> |
|---|
| 28 | #include <asm-leon/winmacros.h> |
|---|
| 29 | #include <asm-leon/leon.h> |
|---|
| 30 | |
|---|
| 31 | /* l0: psr |
|---|
| 32 | l1: pc |
|---|
| 33 | l2: npc |
|---|
| 34 | l3: wim |
|---|
| 35 | l7: irqnr */ |
|---|
| 36 | |
|---|
| 37 | .seg "text" |
|---|
| 38 | |
|---|
| 39 | /* ------- */ |
|---|
| 40 | .weak _leonbare_irq_entry_svt |
|---|
| 41 | .set _leonbare_irq_entry_svt,__leonbare_irq_entry_svt |
|---|
| 42 | .weak leonbare_irq_entry |
|---|
| 43 | .set leonbare_irq_entry,_leonbare_irq_entry |
|---|
| 44 | /* ------- */ |
|---|
| 45 | !.global leonbare_irq_entry,_leonbare_irq_entry_svt |
|---|
| 46 | .global _irqtbl, _irqtrap, handler_irq, fpustate_current |
|---|
| 47 | |
|---|
| 48 | __leonbare_irq_entry_svt: /* irq from svt trap dispatcher */ |
|---|
| 49 | sub %l6,0x10, %l7 |
|---|
| 50 | rd %wim, %l3 |
|---|
| 51 | |
|---|
| 52 | _leonbare_irq_entry: |
|---|
| 53 | set SPARC_PSR_EF_MASK,%l6 |
|---|
| 54 | andn %l0, %l6, %l0 ! fpu off |
|---|
| 55 | |
|---|
| 56 | SAVE_ALL |
|---|
| 57 | |
|---|
| 58 | set nestcount,%o0 |
|---|
| 59 | ld [%o0],%o1 |
|---|
| 60 | add %o1,1,%o1 |
|---|
| 61 | st %o1,[%o0] |
|---|
| 62 | |
|---|
| 63 | #ifdef CONFIG_LEONBARE_NONESTEDIRQ |
|---|
| 64 | or %l0, SPARC_PSR_PIL_MASK, %o0 ! no nested irqs |
|---|
| 65 | wr %o0, SPARC_PSR_ET_MASK, %psr |
|---|
| 66 | WRITE_PAUSE |
|---|
| 67 | #else |
|---|
| 68 | sll %l7,SPARC_PSR_PIL_SHIFT,%o1 |
|---|
| 69 | andn %l0,SPARC_PSR_PIL_MASK,%o0 |
|---|
| 70 | or %l0, %o1, %o1 |
|---|
| 71 | set nestedirq,%o0 |
|---|
| 72 | ld [%o0],%o0 |
|---|
| 73 | cmp %g0,%o0 ! no nested irqs? |
|---|
| 74 | beq,a .L1 |
|---|
| 75 | or %o1, SPARC_PSR_PIL_MASK, %o1 |
|---|
| 76 | .L1: |
|---|
| 77 | wr %o1, SPARC_PSR_ET_MASK, %psr |
|---|
| 78 | WRITE_PAUSE |
|---|
| 79 | #endif |
|---|
| 80 | |
|---|
| 81 | mov %l7, %o0 ! irq level |
|---|
| 82 | call handler_irq ! void handler_irq (int irq, struct leonbare_pt_regs *pt_regs) |
|---|
| 83 | #ifndef _SOFT_FLOAT |
|---|
| 84 | add %sp, FW_REGS_SZ + 8 + SF_REGS_SZ , %o1 ! pt_regs ptr |
|---|
| 85 | #else |
|---|
| 86 | add %sp, SF_REGS_SZ , %o1 ! pt_regs ptr |
|---|
| 87 | #endif |
|---|
| 88 | |
|---|
| 89 | or %l0, SPARC_PSR_PIL_MASK, %o1 |
|---|
| 90 | wr %o1, SPARC_PSR_ET_MASK, %psr ! enable nesting again, keep ET up |
|---|
| 91 | WRITE_PAUSE |
|---|
| 92 | |
|---|
| 93 | set nestcount,%o0 |
|---|
| 94 | ld [%o0],%o1 |
|---|
| 95 | sub %o1,1,%o1 |
|---|
| 96 | st %o1,[%o0] |
|---|
| 97 | |
|---|
| 98 | RESTORE_ALL |
|---|
| 99 | |
|---|
| 100 | .seg "data" |
|---|
| 101 | .global nestedirq |
|---|
| 102 | .align 4 |
|---|
| 103 | nestedirq: |
|---|
| 104 | .long 0 |
|---|
| 105 | .global nestcount |
|---|
| 106 | .align 4 |
|---|
| 107 | nestcount: |
|---|
| 108 | .long 0 |
|---|
